QGraphicsRectItem and QGraphicsTextItem.

[cydside]

Instead of setting the transformation to each item you use and in your particular case, it's better to create your own item and draw the text yourself:
In paint also draw the text via QPainter::drawText() (there are alignment flags) and then rotate the painter by 90°. And don't forget to implement the sizeHint() function.

QPainter will be the best solution when the rect area is smallest than the text, but if I try to create a QPainter object for that QGraphicsScene as the following code:

QGraphicsScene *scene =
      new QGraphicsScene(QRect(0, 0, endX, endY), this);
 
   for (int i = 0; i < 12; i++)
   {
      QGraphicsRectItem *mese =
         new QGraphicsRectItem(QRect(margineX + 2 + 60 * i, endY - margineY + 2, 60, 30), 0, scene);
//      mese->setPen(QPen(Qt::red, 1, Qt::SolidLine));
      mese->setPen(Qt::NoPen);
      mese->setBrush(Qt::NoBrush);
 
 
      QPainter painter(scene);
      painter.drawText(mese, Qt::AlignCenter, mesiAnno.at(i));
      painter.drawRect(mese);

QGraphicsScene *scene =
      new QGraphicsScene(QRect(0, 0, endX, endY), this);

   for (int i = 0; i < 12; i++)
   {
      QGraphicsRectItem *mese =
         new QGraphicsRectItem(QRect(margineX + 2 + 60 * i, endY - margineY + 2, 60, 30), 0, scene);
//      mese->setPen(QPen(Qt::red, 1, Qt::SolidLine));
      mese->setPen(Qt::NoPen);
      mese->setBrush(Qt::NoBrush);


      QPainter painter(scene);
      painter.drawText(mese, Qt::AlignCenter, mesiAnno.at(i));
      painter.drawRect(mese);

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the compiler is not agree with me because:

error: no matching function for call to `QPainter::QPainter(QGraphicsScene*&)'
note: candidates are: QPainter::QPainter(const QPainter&)
note:                 QPainter::QPainter(QPaintDevice*)

error: no matching function for call to `QPainter::QPainter(QGraphicsScene*&)'
note: candidates are: QPainter::QPainter(const QPainter&)
note:                 QPainter::QPainter(QPaintDevice*)

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where do i have to link my QPainter object???

thanks guys, I really appreciate your comments!